Die-stock.



.Patented oct. 22, 1912.l

'ting thread upon'pipe or yin a radial direction to producethread upon the work.

UNIE STATES Eeftllhll @lillldllttlllio CARLES T. BENSON, OF CHICAGO, ILLINOIS, ASSIGNOB- TO THE NYE TOOL AND MACHINE "WORKS, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

DIE-STOCK.

Application filed November 9, 1911.5

To all whom it may concern' 13e 'it known that I, CHARLES T. Benson, a citizen of the United States, residing at Chicago, in the county of Cool; and State ot Illinois, have invented a certain new and useful Improvement in Die-Stocks, of which the Jfollowing is a specilication.

.My invention relates to die stocks for cutsimilar pieces ot' work, and the ob]ect ot the invention is to provide simple and et'ticient means for automatically controlling the chasers, dies or thread cutters as they are variously called, a tapered 1 obtain my object by the mechanism illustrated in the accompanying drawings, in which Figure 1 is an assembly view partly in longitudinal section showing the parts in position upon the pipe. Fig. 2 is a view looking toward the right in Fig-1. Fig. 3

' is a perspective view ot the cam ring, and

Fig. Ll is a perspective view oit one of' the controlling levers.

Similar numerals refer to similar parts throughout'the several views.

The stock body 1 is provided with sockets 2 into which are screwed handles 3 for rotating the chasers upon the work. Chasers or threaded cutters 4 are mounted within the stock body so as to be radially movable. T he chasers are firmly prevented from falling out of place when not in use by spring pins 5 shown in Fig. 2. Jxtending from the stocl body is a tubular portion 6, which is apertured to receive the pipe 7 or other piece of worlr and is threaded to cooperate with the leader bushing 8. Said leader bushing or work holder is furnished with a plurality of setscrews 9 adapted to hold the bushing firmly upon the work. By

' preference, a number of marks 10 are placed upon the set screws to facilitate the centerlng of the worlr and to indicate to the oper- .L". 1 .J 1 l` o* atoi tie 12e o tic pipe w uchsns )eing threaded.

A ring 12, shown u1 perspective in lug. 1%, is mounted upon the leader bushing in such manner as to rotate independently thereof. Said ring is prevented from moving to the right (Fig. 1) by a shoulder 1S formed upon the bushino', as best shown in Fig. 1. A collar 14 screws upon the leader bushing on the opposite side of ring 10 and prevents the latter trom moving toward the Specification of Letters Patent.

Patented Oct. 22, 12510.12.

serial No. 659,340. e

right. The ring is thus rotatable independently ot the leader bushing but is laterally lixed with reference to said bushing and consequently is laterally fixed with ret'erence to the work when the-device is in aetion. In order to cause the ring to rotate in unison with the stock body and at the same time permit it to move toward and from the stoel: body in unison with the leader bush` ing lugs 15 are 'formed upon the ring` and these are apertured to receive guide pins (not shown) which pass through correspondingly apcrtured lugs ,16 in the stock body.

Ring 12 is composed preferably of cast metal and carries a plurality of integral lugs 17. A cam surface 1S is Jformed upon each ot' these lugs and in the preferred construction the cams are formed by slotting the lugs which thus Jr'orm a housing for the'levers 20 which are tulcrumed upon pins 21 carried by the lugs formed upon the stock body. ln the preferred torni the levers are provided 'with integral lugs or bosses Q4 which enga-ge the outer ends ot the chasers and control their position radially. The free ends ot' the levers are engaged by the cam surfaces 18 which are so inclined as to permit the levers to swing outwardly as the stock body and chasers travel along the work during the act ot cutting the thread.

ln operation, before applying the apparatus to the pipe the leader bushing is backed oil1 so that the levers will contact the contracted ends ot the cams and hold the chasers at innermost position to cut the thread lo the greatest required depth. After fastening the pipe in a vise or other holder thelleader bushing is placedover the end of the pipe and rigidly secured thereto at the proper distance from the end thereof in the ordinary manner. The stock body is then rotated, causing the chasers to begin to cut the end of the pipe. As the stock body is rotated the leader bushing causes it to travel along the pipe by reason ot the engagement ot the leader bushing with the thi-ca ded tubular portion ot the stock body. As the stock body travels along the `pipe the free ends ot the levers travel along the earn surfaces on the ring 12, thus permitting the levers to gradually swing` outward ltwill be noted that in 'my construction .carry the'r die thus protected and the diuability and ciency of the tool greatly increased. Furthermore the'parts are simple in consti-nef tion and the tool is tree troni pioieci'ing or delicate parts which might gel ont ot order.

Having thus described my inventionm'hatl claim as new and desire to secure by Leo ters Patentj, is:

l. ln a die stoekyev stock body adapted tocarry the dies, a `leader bushing screwing upon said body and adapted to be' fastened to the Work, die. controlling. levers fulermned at one end upon said stoel( body, and a rotatable and laterally lined earn ring having internal cams arranged lengthwise of the axis adapted to automatically'control said levers.

El. ln a die stock, a stoelr body adapted to czrry the diese a eader bushing screwing upon said body and adapted to be fastened to the work. die controlling levers pivoted et one end to said stock bddy, and a earn ring rotzitable and laterally lined' upon seid leader bushing7 said earn ring beingv apertnred and housing the tree ends ofsaid levers, and the cani'surtaees extending lengthwise ot the asis ot rotatiom 3. ln a die stock, a, stocltibody adapted to' carry the dies, handle sockets on said stoel( body,` a leader' bushing` screwing upon said stoel; body, set screws forfastening the leader bushing to the work, die Controlling levers fulcrinned at one end upon said stoel( body, and a` rotatable and later lly fixed earn ring;r adapted to eonjl rol levers, seid cam ring' beine"l located between the set screws and the handle socket-s.

el. .ln a die stoel;q a stock body adapted to a, leader bushing making screw Connection with said body and adaptH ed to be it'astened to the Work, and a rotatable but laterally fixed earn ring operative upon said levers7 the stoel; body being` aper! tur-ed to receive said levers for housing the saine, and th`e lever tulcrunis'being located at one end of the housing` apertures and the cani ringl at the other.

5. ln a die steelt, a stoel; body adapted to earry the dies, handle sockets on said stoelr body, a leader limshino making screw corr neetion with .aid stock body and adapted to be fastened to the Work, die controlling.; I,

lovers pivoted to said stock body,y and a cam ing ring rotatable and laterally fined upon said leader bashing, said ring and the lever plv.-

ots being on oppositesides of the handle sockets,

6. A 'device of the class described compris-l ing a stoel: body adapted to carry the dies, die controlling .levers pivoted to said stock body' near the end thereof and extending inward along said stock body, a` leader bush v ing at the inner end of said stock body malrscrev'v connection thereivitln and a cani rino' adapted to engage said levers. said ringand the lever fulcroins being located on op posite sides of the dies.

7. ln combination, a stoel; body having a threaded tubular extension adapted tore.

eeive the Work, chasers mounted in sai-d stock body, a threaded leader bushing` screw-.

theV stoel: body and adaptedto be fastened to the Workg levers uleruined upon said stoel; body and adapted to engage the outer ends of the chasers at a point between the 'ends oit tliedevers, and a ring' rotatably lChasers radially movable Within said stools body and adapted to be engaged by said levers at a point intermediate of the tremities of said levers. l

il. In eorobination,a stoel: body having lugsprojeeting in one direction therefrom and. a. threaded tilbular projection extending in the opposite direction therefrinn9 ay ringl on the side of the stock body oyiposite to'said logs, cams on said ring;`r a threaded leader bushing seres-'ing onto the threaded tubiilar portion of said stock body, said ring," being .laterally lined upon and .rotatable independently of sailleader busliinff, mounted in, said stock body and levers adapted to. Contact said chasers at a point between ythe ends of said leversa said levers being inlerinned aty one end upon said lugsv and et the other end contacting said Canis, substantially as described.

ln Witness whereof, have hereunto subscribed iny naine in the presence ol tivo Witnesses. y

CHARLES T. BENSN., lllit-nesses:

Heimen Cox, lvanonnnr l). Rose.-

chasers ing onto said threaded tubular portion of r eo 

